Hi Phúc,
Thank you for
reaching out to Syncfusion Support.
We have checked
the reported query, and by using the below CSS style, you can change the filter
input of the listbox component. Please refer to the code snippets and sample
below.
|
.e-listbox-container
.e-input-group.e-input-focus {
border-color: green !important;
box-shadow: 0 0 0 1px green
!important;
}
|

Sample link: https://blazorplayground.syncfusion.com/rNBzZHLJhyrVmoix
Please let us
know if you need any further assistance on this.
Regards,
KeerthiKaran K
V